How to guide the cultivation of vegetables and lai in the twenty-four solar terms in the south

To some extent, watering directly determines the growth, yield and quality of vegetables in summer. High temperature in summer makes soil and plants transpiration water quickly, which is prone to drought, affects the growth of vegetables and easily induces viruses. But improper watering can also lead to physiological diseases. Specific summer watering should pay attention to the following four points:

Don't water at noon. Some vegetable farmers think that the temperature is the highest at noon, and watering at this time just cools the vegetables. In fact, watering at noon can easily lead to the phenomenon of "fried" roots after vegetables are stimulated by cold water, which will greatly reduce the yield of vegetables. Therefore, watering before 10 in the morning can not only reduce the temperature, but also do no harm to the roots of vegetables.

Don't flood. Many vegetable farmers think that the temperature is high in summer, so when using pesticides to water greenhouse vegetables, they should use flooding, which can reduce the temperature, ensure the water supply of vegetables and be beneficial to the growth of vegetables. However, as we all know, flooding is easy to make fields accumulate water. Under anaerobic environment, root respiration is inhibited, and root retting, root rot and leaf yellowing are easy to occur, which seriously affects fruit yield and even leads to the death of the whole plant, especially sweet pepper, tomato and other crops that are afraid of waterlogging. Therefore, even in summer, the amount of water should not be too large. In order to avoid water shortage of root system on one side of the big ditch, it is best to irrigate alternately in large and small rows.

Don't alternate dry and wet. Eggplant and melon vegetables are easy to crack when dry and wet alternate at fruiting stage. This is because when the soil is dry and short of water, the fruit expansion is inhibited. Once watered too much, the fruit absorbs water quickly, and the fruit expands faster, especially when the pulp absorbs a lot of water and the peel grows relatively slowly, it is easy to crack, which is especially obvious in tomatoes and melons.